How many types of sensory receptors have been identified?

Five types of sensory receptors, each responding to a different type of stimulus, have been identified.

Chemoreceptors—Respond to chemical compounds such as odor molecules
Photoreceptors—Respond to light
Thermoreceptors—Respond to changes in temperature
Mechanoreceptors—Respond to changes in pressure or movement
Pain receptors—Respond to stimuli that result in the sensation of pain

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